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关于完全二叉树严谨性补充：完美二叉树是一棵特殊的完全二叉树，完全二叉树的最底层节点可以是满的。
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### 完全二叉树
如下图所示，<u>完全二叉树（complete binary tree）</u>只有最底层的节点未被填满，且最底层节点尽量靠左填充。
如下图所示，<u>完全二叉树（complete binary tree）</u>只有最底层的节点未被填满，且最底层节点尽量靠左填充。特别的，如果最后一层节点被填满，则这棵树既是完美二叉树，又是完全二叉树。
![完全二叉树](binary_tree.assets/complete_binary_tree.png)